surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

• thanks
• thanks be
• thanksgiver
• thanksgivers
• thanksgiving
• Thanksgiving Day
• thanksgivings
• thanks to
• thank thanks for nothing
• thankworthily
• thankworthiness
• thankworthinesses
• thankworthy
• thank you
• thankyou
• thank you for nothing
• thank-you-ma'am
• thankyous
• thanna
• thannah
• thar
• tharborough
• tharboroughs
• Thargelia
• thars